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freebsd-src/include/stddef.h

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BSD 4.4 Lite Include Sources
1994-05-24 10:57:34 +01:00
/*-
include: further adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
2017-11-20 19:45:28 +00:00
* SPDX-License-Identifier: BSD-3-Clause
*
BSD 4.4 Lite Include Sources
1994-05-24 10:57:34 +01:00
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
Remove the Berkeley clause 3's. Add a few $FreeBSD$
2010-02-16 19:39:50 +00:00
* 3. Neither the name of the University nor the names of its contributors
BSD 4.4 Lite Include Sources
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* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _STDDEF_H_
#define _STDDEF_H_
Move __offsetof() macro from <machine/ansi.h> to <sys/cdefs.h>. It's hardly MD, since all our platforms share the same macro. It's not really compiler dependent either, but this helps in reducing <machine/ansi.h> to only type definitions.
2002-07-08 17:43:35 +01:00
#include <sys/cdefs.h>
Change the definition of NULL on ia64 (for LP64 compilations) from an int constant to a long constant. This change improves consistency in the following two ways: 1. The first 8 arguments are always passed in registers on ia64, which by virtue of the generated code implicitly widens ints to longs and allows the use of an 32-bit integral type for 64-bit arguments. Subsequent arguments are passed onto the memory stack, which does not exhibit the same behaviour and consequently do not allow this. In practice this means that variadic functions taking pointers and given NULL (without cast) work as long as the NULL is passed in one of the first 8 arguments. A SIGSEGV is more likely the result if such would be done for stack-based arguments. This is due to the fact that the upper 4 bytes remain undefined. 2. All 64-bit platforms that FreeBSD supports, with the obvious exception of ia64, allow 32-bit integral types (specifically NULL) when 64-bit pointers are expected in variadic functions by way of how the compiler generates code. As such, code that works correctly (whether rightfully so or not) on any platform other than ia64, may fail on ia64. To more easily allow tweaking of the definition of NULL, this commit removes the 12 definitions in the various headers and puts it in a new header that can be included whenever NULL is to be made visible. This commit fixes GNOME, emacs, xemacs and a whole bunch of ports that I don't particularly care about at this time...
2003-12-07 21:10:06 +00:00
#include <sys/_null.h>
o Merge <machine/ansi.h> and <machine/types.h> into a new header called <machine/_types.h>. o <machine/ansi.h> will continue to live so it can define MD clock macros, which are only MD because of gratuitous differences between architectures. o Change all headers to make use of this. This mainly involves changing: #ifdef _BSD_FOO_T_ typedef _BSD_FOO_T_ foo_t; #undef _BSD_FOO_T_ #endif to: #ifndef _FOO_T_DECLARED typedef __foo_t foo_t; #define _FOO_T_DECLARED #endif Concept by: bde Reviewed by: jake, obrien
2002-08-21 17:20:02 +01:00
#include <sys/_types.h>
BSD 4.4 Lite Include Sources
1994-05-24 10:57:34 +01:00
Add guards to ptrdiff_t definition in include/stddef.h Back in 2011 obrien has added the #define macro in sys/sys/stddef.h to guard ptrdiff_t. Add similar protection to the identical code in include/stddef.h. Submitted by: Mariusz Zaborski <oshogbo@FreeBSD.org> MFC after: 1 week
2014-08-21 16:10:10 +01:00
#ifndef _PTRDIFF_T_DECLARED
o Merge <machine/ansi.h> and <machine/types.h> into a new header called <machine/_types.h>. o <machine/ansi.h> will continue to live so it can define MD clock macros, which are only MD because of gratuitous differences between architectures. o Change all headers to make use of this. This mainly involves changing: #ifdef _BSD_FOO_T_ typedef _BSD_FOO_T_ foo_t; #undef _BSD_FOO_T_ #endif to: #ifndef _FOO_T_DECLARED typedef __foo_t foo_t; #define _FOO_T_DECLARED #endif Concept by: bde Reviewed by: jake, obrien
2002-08-21 17:20:02 +01:00
typedef __ptrdiff_t ptrdiff_t;
Add guards to ptrdiff_t definition in include/stddef.h Back in 2011 obrien has added the #define macro in sys/sys/stddef.h to guard ptrdiff_t. Add similar protection to the identical code in include/stddef.h. Submitted by: Mariusz Zaborski <oshogbo@FreeBSD.org> MFC after: 1 week
2014-08-21 16:10:10 +01:00
#define _PTRDIFF_T_DECLARED
#endif
BSD 4.4 Lite Include Sources
1994-05-24 10:57:34 +01:00
o Merge <machine/ansi.h> and <machine/types.h> into a new header called <machine/_types.h>. o <machine/ansi.h> will continue to live so it can define MD clock macros, which are only MD because of gratuitous differences between architectures. o Change all headers to make use of this. This mainly involves changing: #ifdef _BSD_FOO_T_ typedef _BSD_FOO_T_ foo_t; #undef _BSD_FOO_T_ #endif to: #ifndef _FOO_T_DECLARED typedef __foo_t foo_t; #define _FOO_T_DECLARED #endif Concept by: bde Reviewed by: jake, obrien
2002-08-21 17:20:02 +01:00
#ifndef _SIZE_T_DECLARED
typedef __size_t size_t;
#define _SIZE_T_DECLARED
BSD 4.4 Lite Include Sources
1994-05-24 10:57:34 +01:00
#endif
Don't define wchar_t if we are a C++ compiler. PR: 31864, 40084
2002-07-09 06:13:30 +01:00
#ifndef __cplusplus
o Merge <machine/ansi.h> and <machine/types.h> into a new header called <machine/_types.h>. o <machine/ansi.h> will continue to live so it can define MD clock macros, which are only MD because of gratuitous differences between architectures. o Change all headers to make use of this. This mainly involves changing: #ifdef _BSD_FOO_T_ typedef _BSD_FOO_T_ foo_t; #undef _BSD_FOO_T_ #endif to: #ifndef _FOO_T_DECLARED typedef __foo_t foo_t; #define _FOO_T_DECLARED #endif Concept by: bde Reviewed by: jake, obrien
2002-08-21 17:20:02 +01:00
#ifndef _WCHAR_T_DECLARED
Rename __wchar_t so it no longer conflicts with __wchar_t from clang 3.4 -fms-extensions. MFC after: 2 weeks
2014-04-01 15:46:11 +01:00
typedef ___wchar_t wchar_t;
o Merge <machine/ansi.h> and <machine/types.h> into a new header called <machine/_types.h>. o <machine/ansi.h> will continue to live so it can define MD clock macros, which are only MD because of gratuitous differences between architectures. o Change all headers to make use of this. This mainly involves changing: #ifdef _BSD_FOO_T_ typedef _BSD_FOO_T_ foo_t; #undef _BSD_FOO_T_ #endif to: #ifndef _FOO_T_DECLARED typedef __foo_t foo_t; #define _FOO_T_DECLARED #endif Concept by: bde Reviewed by: jake, obrien
2002-08-21 17:20:02 +01:00
#define _WCHAR_T_DECLARED
BSD 4.4 Lite Include Sources
1994-05-24 10:57:34 +01:00
#endif
Don't define wchar_t if we are a C++ compiler. PR: 31864, 40084
2002-07-09 06:13:30 +01:00
#endif
BSD 4.4 Lite Include Sources
1994-05-24 10:57:34 +01:00
Use __ISO_C_VISIBLE, as opposed to testing __STDC_VERSION__. FreeBSD's C library uses __STDC_VERSION__ to determine whether the compiler provides language features specific to a certain version of the C standard. __ISO_C_VISIBLE is used to specify which library features need to be exposed. max_align_t currently uses __STDC_VERSION__, even though it should be using __ISO_C_VISIBLE to remain consistent with the rest of the headers in include/. Reviewed by: dim MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D11303
2017-06-22 19:39:52 +01:00
#if __ISO_C_VISIBLE >= 2011 || __cplusplus >= 201103L
Define max_align_t for C11. libc++'s stddef.h includes an existing definition of max_align_t for C++11, but it is only defined for C++, not for C. In addition, GCC and clang both define an alternate version of max_align_t that uses a union of multiple types rather than a plain long double as in libc++. This adds a __max_align_t to <sys/_types.h> that matches the GCC and clang definition that is mapped to max_align_t in <stddef.h>. PR: 210890 Reviewed by: dim MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D8194
2016-10-22 00:50:02 +01:00
#ifndef __CLANG_MAX_ALIGN_T_DEFINED
typedef __max_align_t max_align_t;
#define __CLANG_MAX_ALIGN_T_DEFINED
Use the correct name for the GCC macro indicating max_align_t is defined. MFC after: 3 days
2016-11-29 00:16:19 +00:00
#define _GCC_MAX_ALIGN_T
Define max_align_t for C11. libc++'s stddef.h includes an existing definition of max_align_t for C++11, but it is only defined for C++, not for C. In addition, GCC and clang both define an alternate version of max_align_t that uses a union of multiple types rather than a plain long double as in libc++. This adds a __max_align_t to <sys/_types.h> that matches the GCC and clang definition that is mapped to max_align_t in <stddef.h>. PR: 210890 Reviewed by: dim MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D8194
2016-10-22 00:50:02 +01:00
#endif
#endif
Sync (make same) the offsetof macro definition in include/ with the definition of the same in sys/sys/. The problem was discovered while working on implementing a new C11 gets_s() for libc. (The new gets_s() requires rsize_t found in include/stddef.h.) The solution to sync the two definitions was suggested by ed@ while discussing D12667. Suggested by: ed MFC after: 2 weeks
2017-10-15 03:40:13 +01:00
#define offsetof(type, field) __offsetof(type, field)
BSD 4.4 Lite Include Sources
1994-05-24 10:57:34 +01:00
Implement the memset_s(3) function as specified by the C11 ISO/IEC 9899:2011 Appendix K 3.7.4.1. Other needed supporting types, defines and constraint_handler infrastructure is added as specified in the C11 spec. Submitted by: Tom Rix <trix@juniper.net> Sponsored by: Juniper Networks Discussed with: ed MFC after: 3 weeks Differential revision: https://reviews.freebsd.org/D9903 Differential revision: https://reviews.freebsd.org/D10161
2017-03-30 05:57:26 +01:00
#if __EXT1_VISIBLE
/* ISO/IEC 9899:2011 K.3.3.2 */
#ifndef _RSIZE_T_DEFINED
#define _RSIZE_T_DEFINED
typedef size_t rsize_t;
#endif
#endif /* __EXT1_VISIBLE */
BSD 4.4 Lite Include Sources
1994-05-24 10:57:34 +01:00
#endif /* _STDDEF_H_ */
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